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BS 450-2-2017
Cross recessed 90° countersunk flat head screws-Table 2
Nom
P
dk max
dk min
k max
t max
t min
M
No.
1/8
40
0.219
0.201
0.056
0.068
0.052
0.099
1
3/16
24|32
0.328
0.307
0.084
0.106
0.088
0.166
2
1/4
20|26
0.438
0.412
0.113
0.146
0.128
0.25
3
5/16
18|22
0.547
0.518
0.141
0.168
0.15
0.309
4
3/8
16|20
0.656
0.624
0.169
0.216
0.198
0.357
4
7/16
14|18
0.766
0.729
0.197
0.245
0.227
0.386
4
1/2
12|16
0.875
0.835
0.225
0.276
0.258
0.417
4
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